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https://issues.apache.org/jira/browse/LUCENE-6959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15082571#comment-15082571
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Mikhail Khludnev commented on LUCENE-6959:
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Here is the recently arrived
[BlockJoinFacetCollector|https://github.com/apache/lucene-solr/blob/trunk/solr/core/src/java/org/apache/solr/search/join/BlockJoinFacetCollector.java#L66]
also calls getChildren(). It seems it works under SolrIndexSearcher, and it's
not easy to use a dedicated searcher in Solr.
> Remove ToParentBlockJoinCollector
> ---------------------------------
>
> Key: LUCENE-6959
> URL: https://issues.apache.org/jira/browse/LUCENE-6959
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
>
> This collector uses the getWeight() and getChildren() methods from the passed
> in Scorer, which are not always available (eg. disjunctions expose fake
> scorers) hence the need for a dedicated IndexSearcher
> (ToParentBlockJoinIndexSearcher). Given that this is the only collector in
> this case, I would like to remove it.
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